【摘要】 为了研究体外预应力组合梁负弯矩区抗弯承载能力,完成了2片体外预应力梁在负弯矩作用下的受弯性能试验.探讨了影响部分连接预应力钢-混凝土组合连续梁负弯矩区受力性能的主要因素,了解裂缝产生与发展的主要规律及对结构受力性能的影响.建立了弹性阶段和塑性阶段的计算模型.结果表明剪力连接程度的提高,对负弯矩区截面抗弯承载能力提高作用不明显,但是可以改善正常使用阶段梁的刚度.运用本文公式对试验梁计算结果较试验值约偏小10%,可以满足设计精度要求.更多还原

【Abstract】 In order to study the behavior of external prestressed beams under negative moments,two beams’ flexure behaviors under negative moment were tested.The main factors affected the behavior of partially connected externally prestressed steel-concrete composite beams were investigated.The caused and development of cracks and its affections on the performances of the beams were proposed.Two compute models calculating the elastic bending capacity and the plastic bending capacity were established.The results show that the bending capacity change is not obvious with the connection degree,and the stiffness of regular service beam is enlarged.The results computed were 10% smaller than the test ones,which can satisfy the request designing accuracy.更多还原